Colloquium: Herbertsmithite and the search for the quantum spin liquid
Colloquium: Herbertsmithite and the search for the quantum spin liquid
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DOI：
10.1103/revmodphys.88.041002
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发表时间：
2016-12-02
影响因子：
44.1
通讯作者：
Norman, M. R.
中科院分区：
文献类型：
--
作者：
Norman, M. R.
量子自旋液体形成了一类新的物质，尽管存在强交换相互作用，但自旋不会在最低测量温度下有序。通常，这些发生在晶格中，以阻止磁性的出现。在二维中，经典的例子是由角共享三角形组成的kagome晶格。有多种矿物的过渡金属离子形成这样的晶格。因此，他们中的一些人进行了研究，然后合成，以获得更多的原始样品。特别值得注意的是2005年Dan Nocera小组的报告，该报告合成了由位于可果美晶格上的铜离子晶格组成的赫伯茨米特，尽管存在17 meV的大交换相互作用，但在最低测量温度下确实不有序。在过去的十年中，这种材料被广泛研究，产生了许多有趣的惊喜，反过来又激发了对kagome晶格上自旋1/2海森堡模型的理论研究的兴趣。本次学术讨论会回顾了这些发展，然后讨论了潜在的未来方向，包括实验和理论，以及掺杂这些材料的挑战，希望这可能导致发现新的拓扑和超导相。
Quantum spin liquids form a novel class of matter where, despite the existence of strong exchange interactions, spins do not order down to the lowest measured temperature. Typically, these occur in lattices that act to frustrate the appearance of magnetism. In two dimensions, the classic example is the kagome lattice composed of corner sharing triangles. There are a variety of minerals whose transition metal ions form such a lattice. Hence, a number of them have been studied and were then subsequently synthesized in order to obtain more pristine samples. Of particular note was the report in 2005 by Dan Nocera's group of the synthesis of herbertsmithite, composed of a lattice of copper ions sitting on a kagome lattice, which indeed does not order down to the lowest measured temperature despite the existence of a large exchange interaction of 17 meV. Over the past decade, this material has been extensively studied, yielding a number of intriguing surprises that have in turn motivated a resurgence of interest in the theoretical study of the spin 1/2 Heisenberg model on a kagome lattice. This Colloquium reviews these developments and then discusses potential future directions, both experimental and theoretical, as well as the challenge of doping these materials with the hope that this could lead to the discovery of novel topological and superconducting phases.